Camacdonald.com: C. A. MacDonald Home Page

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Birdingpal.com: Birdwatching contacts and information around the world.

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Trails.com: Hiking Trails, Mountain Bike Trails & Trail Maps | Trails.com

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Dc.about.com: Washington DC - A Guide to Washington, DC & the Maryland and Virginia Suburbs

Find a comprehensive guide to Washington DC and the surrounding communities of Maryland and Northern Virginia. Find tips for travel planning to the Washington, DC capital region, including information on lodging, dining, entertainment and sightseeing. Articles on education, real estate, recreation, sports, family activities and more.

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Americanbirdcenter.com: Bird Watching United States and Canada North America Bird Watching - Birding Alaska Accommodation Bed and Breakfasts Birdwatching Tours Events

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En.wikipedia.org: Wikipedia, the free encyclopedia

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Paid traffic cost: $0.3

Birding.com: Bird Watching In the USA and Around the World | birding .com

Welcome to Birding.com, the best online resource for all your bird watching needs.

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Canaltrust.org: Canal Trust - Restoring Our Heritage...Building a Legacy

The C&O Canal Trust is a nonprofit organization whose mission is to work in partnership with the National Park Service to protect, restore, and promote the C&O Canal National Historical Park. The Trust seeks to ensure that the park's natural, historical, and recreational potential is fully realized.

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Shorpy.com: Shorpy Historic Photo Archive | Vintage Fine Art Prints

High-resolution vintage photo archive with thousands of HD images.

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Sea-quest-kayak.com: Sea Kayaking San Juan Islands: Orca Whale Kayak Tours Washington Trips Seattle Vacations Adventures

Sea Quest specializes in biologist guided sea kayaking tours & vacations. Kayak trips & adventures to the premier whale waters of the world.

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Paid traffic cost: $2.29K

Hmdb.org: The Historical Marker Database

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Paid traffic cost: N/A